Okay, you'll have to forgive the general crudeness of this picture, but here is how the five circuits fit together:
Although the bits I've added in aren't as pronounced. I fact, I'd say they aren't really there at all; they're just to show where the two points of each circuit link up.
Only things its missing is a couple of longish straights. Otherwise its like the first few Colin Mcrae rally games, where they didn't seem to have many/any decent length straights for some reason.